public static void MakeNodeBlack <K, V, N>(this RedBlackTreeNodeBase <K, V, N> node)
where N : RedBlackTreeNodeBase <K, V, N>
{
if (node != null)
{
node.Color = RedBlackTreeNodeColor.Black;
}
}
public static bool IsBlack <K, V, N>(this RedBlackTreeNodeBase <K, V, N> node)
where N : RedBlackTreeNodeBase <K, V, N>
=> node == null || node.Color == RedBlackTreeNodeColor.Black;
public static bool IsRed <K, V, N>(this RedBlackTreeNodeBase <K, V, N> node)
where N : RedBlackTreeNodeBase <K, V, N>
=> node != null && node.Color == RedBlackTreeNodeColor.Red;